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08b sex & copulation

08b sex & copulation - sexual status Bateman’s...

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Bateman’s Predictions …of universal sex differences in behavior: M promiscuity vs. F monandry M sexual ardor vs. F sexual passivity   indiscriminate M vs. discriminating F   paternal disinvestment vs. maternal care
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Female Advertisement: Sex Swellings *  7% (25 spp) of primates have    conspicuous mid-cycle swellings *  indicate probability of ovulation  (imprecise cue) *  costly to the female    (14-25% weight increase) *  MM prefer to mate with FF with larger swellings *  increase male attention &    promote sexual activity
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Advertisement & F-F Competition Eviction:  Adult FF maintain reproductive privileges by  targeting aggression against daughters & evicting them from  social unit.  Scentmarking:  by FF shows little evidence of territorial function &  likely serves in intra-group communication (to advertise dominance & 
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Unformatted text preview: sexual status) Bateman’s ‘Other’ Data (1948) males 2 1 3 4 2 1 3 4 Relative fertility Number of mates females Female Promiscuity * multiple mating (with >1 M) * preference for certain MM (novelty, familiarity, status) * indiscriminate mating * repeated mating (>1X per partner) * copulation outside fertile period (nonprocreative) challenges ‘F choice’ Genital Lock Initial phase of coitus Locking phase of coitus Copulatory Patterns Mounting: Suspended Leg lock Double foot clasp Intromission: Genital ‘locks’ (vs. functional locks in canids) Ejaculation Pelvic thrusting (norm) Single prolonged (SPI) vs. multiple brief (MBI) Single vs. multiple Male Orgasm Female Orgasm...
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